Automatic braking device for phonographs and the like



March 14, 1933. R. 0. DE LA QUINTANA AUTOMATIC BRAKING DEVICE FOR PHONOGRAPHS AND THE LIKE Filed Jan. 31, 1930 Isnnentor Patented Mar. 14, 1933 UNITED STATES.

PAT

Ran-L ORZABAL DE LA. QUINTANA, or BUENOS Ainns, ARGENTINA AUTOMATIC BRAKING DEVICE ron PnoNoenAr'i-is AND THE LIKE Application filed January 31,1930, Serial No. 424,939, and in Argentina May 10, 1929.

My present inventionrelates to an, automatic braking device for phonographs and the like said device being sensible to the variation of the angular speed of the acoustic arm of the phonograph. These variations take place at the end of the records, when the needle enters a spiral groove or'cencentric circle- Inorder that my invention may be clearly 19 understood and easily carried intopractice it has been shownin the appended drawing, wherein-z Fig. I is a top view of the" apparatus shown in dotted lines.

Fig; 2 is a top view of the apparatus showing a portion of the flywheel.

Figs. 3 and 4 show fragmentary perspective views of parts of the apparatus.

Similar reference characters denote same or like parts throughout the said drawing.

0'0nstm0fiz'0n.A vertical projecting rod A isfixed to the acoustic arm of the phonograph, said rod moving on a circular path having its center around the rear end of the the arm. This rod will transmit movement to the device proper.

The rod A transmits a rotary movement tothe lever G around the pivot D. The le ver C has a forked end in which the rod A t r the other end being provided with a toothed sector E having its center at D.

Said toothed sector E meshes with a toothed wheel G turning on an axle F, said toothed wheel-Gbeing fixed-to a'fiy-wheel I-I.

The axle F is fixed to the end of a second lever I having its center ofrotation at N. The opposite endof the lover I isprovided with a tooth J.

Said lever is mounted co-axially with the member K which form may be easily seen from the drawing.

The normal resting position of the lever I is determined by the sprin L, which pushes it against the stop ixed on the member'K.

' clearly seen from the drawing, rotates on the pivot'Q, and is provided with'a braking shoe R and has a v shaped leverS having its center of rotation at V, said 'piece S be ing kept in the position shown in the drawing by means of the spring T and the stop U. The piece P is brought towards W by means of the spring X, but cannot move, as the end of the leverS rests against the tooth J on'the lever I.

Y is theleveron which the brake shoe R is mounted, Z is the periphery representing the rim of the turning-table on which the record is carried; 1

0pemtz'0n."The displacement I of the needle and in consequence, of the acoustic arm, while playing a record is-from 1 to 2, Fig.1, and hence, the toothed sector E forming' a part of the lever C and having its center of rotationat D will move in an are from '3 to 4, Fig. 1, due to theaction of the rod A fixed to the said acoustic arm. .When

the sector E, on its slow turning movement reaches a position such as shown in Fig. 2, it

will mesh with thetoothed wheel G, forcing this to slowly-rotate, together with-the flywheelH, around the axle F.- These uniform movements will continue while'the needle runs within the record groove. However, when the needle reaches the end of the record and enters the usual large spiral groove or excentric circumference, this will cause. an increase in the slow angular speed of the arm. Said increase or acceleration will produce a sudden increase in the speed of the sector E and this will tend to accelerate the rotation of the system. constituted by the toothed-wheel and fly-wheel. as this latter has a considerable moment of inertia with respect'to its pivot of rotation F, it will offer a resistance to the increase of speed, and then, the lever vI will be carriedby the system of pinion and fly-wheel, and it will turn aroundthe pivot N, against.

the small action of the spring L. On r'otating the lever I, the tooth J sets'free the end of the piece S, which, as already explained, is interconnected with the piece P, thislatter being now-free and being drawn by the spring X to turnaround the pivot Q,

we I whereby the shoe R will be applied against the edge of the turn-table and brake it.

In the meantime, the piece K, drawn by the spring 0, will continue resting on the piece P and will in consequence effect a rotation around N, carrying with it the lever l forming part thereof. This displacement will pass the pinion G to the position Gr, out of contact with the toothed sector E and in consequence, the lever system C and the acoustic arm will be set free to be moved to an adequate position to .play a new record.

The system of the members P and S, allows the turn-table to be braked, when. desired, by means'of the lever Y. In fact, when moving the lever Y downwardly I it forces the spring T to recede, but the dis.

free of the tooth J whereby the piece 1? will be free from the influence of X and the shoe R will brake the turn-table. c

7 It is obvious that in carrying out the invention some mechanical detailsof the device maybe altered. For instance, the

forked endof the lever O'may be suppressed and an elastic means, such as 0, may be used to bring ittowards the rod A, in which be limited by a suitable stop. -When using this construction the piece K and spring I O mayalso be eliminated, but the stop M shouldalways subsist, it being fixed to-the general frame. This construction has .the

further advantage of keeping the sector in the braking of phonograph turn-tables, but

also in connection with other machines working under similar conditions.

For the braking of phonographs, having an electric motor, the braking device will act on a switch cutting 01f the current of the motor.

Having now fullydescribed and ascertamed the nature of my present invention andin what manner the same is to be carried 1nto practice, I declare that whatI cla1m is:

1. braking device particularly for phonographs, comprising a rod mounted on an acoustic arm of the phonograph; a pivv oted lever cooperating with said rod; a pivotally-mounted brake lever adapted to brake a turn-tableof the. phonograph; and means includmg a fly-wheel cooperating with said pivoted lever and the brake lever whereby, due to the inertia of the fly-wheel relative to its center of rotation, the brake lever is set against the turntable when the acoustic arm has attained a small sudden increase in its angular speed.

2. A braking device particularly for phonographs, comprising a rod mounted on an acoustic arm of the phonograph; a pivoted lever cooperating withsaid rod; a pivotally-mounted brake lever adapted to brake a turn-table of the phonograph; means including a fiy-wheel cooperating with said pivoted lever and the brake lever whereby, due to the'inertia of the fly-wheel relative .to its center of rotation, the brake lever is set against the turn-table when the acoustic arm has attained a small sudden increase in its angular speed; and ahand lever to brake the turn-table: irrespective of the operation of the fly-wheel.

3. A braking device, particularly for phonographs, comprising apivoted lever c0- operating; with an acoustic arm of the phonograph; a. brake lever adapted to brake a turn-table of the phonograph; and means including a fly-wheel cooperating with said pivoted lever and the brake lever whereby, due to the inertia of the fly-wheel relative I to its center of rotation, the brake lever is set against the turn-table when the acoustic arm has attained a small sudden increase in its angular speed. 7 f

4. A braking device particularly for phonographs, comprising a pivoted lever cooperating with an acoustic arm of the phonograph; a brake lever adapted to brake a turn-table of the phonograph; a pivoted lever adapted to cooperate with the brake lever; and means including a fly-wheel mounted on the last-named pivoted leverand cooperating with the brake lever whereby, due to the inertia of the fly-wheel relative to its center of rotation, the brake'lever is set against the turn-table when the acoustic arm has attained a small sudden increase in its angular, speed. A 5. A braking device I particularly for phonographs, comprising a pivoted lever cooperating with an acoustic arm of the phono- 1 graph; a brake lever adapted to brake a turn-table of the phonograph; means including a fly-wheel cooperating with said pivoted lever and the brake lever whereby,

'llO

due to the inertia of the fly-wheel relative to 5120 its center of rotation, the brake lever is set against the turn-table when the acoustic arm has attained-a small'sudden increase in its angular speed; and means for disconnecting the fly-wheel from the acoustic arm when in the'braking position. I

6. A braking device particularly for phonographs, comprising-a pivoted lever 00- operating withan acoustic arm of the phonograph; a brake lever adapted to brake a.

turn-table of the phonograph; a pivoted lever adapted to cooperate with the brake lever; means including a fly-Wheel mounted on the last-named pivoted lever and cooperating with the brake lever whereby, due to the inertia of the fly-wheel relative to its center of rotation, the brake lever is set against the turn-table when the acoustic arm has attained a small sudden increase in I its angular speed; and means for disconnecting the fly-wheel from the acoustic arm when in the braking position. i

In testimony whereof I aifix my signature.

RAUL ORZABAL DE LA QUINTANA. 

